EP2420457A1 - Boîtier - Google Patents
Boîtier Download PDFInfo
- Publication number
- EP2420457A1 EP2420457A1 EP10764520A EP10764520A EP2420457A1 EP 2420457 A1 EP2420457 A1 EP 2420457A1 EP 10764520 A EP10764520 A EP 10764520A EP 10764520 A EP10764520 A EP 10764520A EP 2420457 A1 EP2420457 A1 EP 2420457A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- resin
- resin composition
- functional resin
- layer
- functional
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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- 239000011347 resin Substances 0.000 claims abstract description 104
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- 230000004888 barrier function Effects 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 239000000155 melt Substances 0.000 claims description 24
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- 239000010410 layer Substances 0.000 description 122
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- 101000576320 Homo sapiens Max-binding protein MNT Proteins 0.000 description 22
- 229920006121 Polyxylylene adipamide Polymers 0.000 description 22
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- 238000002156 mixing Methods 0.000 description 11
- 230000001590 oxidative effect Effects 0.000 description 11
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- 229910052723 transition metal Inorganic materials 0.000 description 10
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- GKXVJHDEWHKBFH-UHFFFAOYSA-N [2-(aminomethyl)phenyl]methanamine Chemical compound NCC1=CC=CC=C1CN GKXVJHDEWHKBFH-UHFFFAOYSA-N 0.000 description 8
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- 229920006026 co-polymeric resin Polymers 0.000 description 2
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- 239000003086 colorant Substances 0.000 description 2
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- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
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- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
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- 239000008188 pellet Substances 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
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- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
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- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
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- 150000004760 silicates Chemical class 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
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- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
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- 229910052718 tin Inorganic materials 0.000 description 1
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Images
Classifications
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- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
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- B32B2307/724—Permeability to gases, adsorption
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- B32B2553/00—Packaging equipment or accessories not otherwise provided for
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/1397—Single layer [continuous layer]
Definitions
- This invention relates to a package having a layer forming an island-in-the-sea structure that comprises a base resin and a functional resin composition containing inorganic fine particles. More specifically, the invention relates to a multi-layer package excellent in barrier property and transparency, and forming an island-in-the-sea structure of a high domain density without impairing the formability into containers.
- the container walls have heretofore been formed in a multi-layer structure using a polyester resin as inner and outer layers, and using, as an intermediate layer, a functional resin such as an ethylene/vinyl alcohol copolymer or a xylylene group-containing polyamide resin for improving gas-barrier property, or a cyclic olefin copolymer for improving water vapor (moisture)-barrier property (patent document 1).
- a functional resin such as an ethylene/vinyl alcohol copolymer or a xylylene group-containing polyamide resin for improving gas-barrier property, or a cyclic olefin copolymer for improving water vapor (moisture)-barrier property
- patent document 4 discloses blending a xylylene group-containing polyamide with an organic clay to further improve gas-barrier property of the xylylene group-containing polyamide resin.
- Patent Documents
- the function or transparency possessed by the functional resin composition can be desirably expressed by controlling the island portions (domains) to possess a desired diameter by adjusting the melt viscosities of the base resin and the functional resin composition depending on the blended amounts of the base resin and the functional resin composition. If a melt viscosity of the functional resin composition is higher than a melt viscosity of the base resin, in general, the island-in-the-sea structure can be easily formed despite the functional resin composition is blended in large amounts. If the melt viscosity of the base resin is low, however, the formability becomes poor and it becomes difficult to efficiently produce the containers.
- an object of the present invention to provide a package excellent in barrier property, transparency and appearance, and having a layer forming an island-in-the-sea structure of a small domain diameter and a high domain density without impairing the formability into containers.
- a package having a mixed layer of a mixture of a base resin and a functional resin composition containing inorganic fine particles (hereinafter often simply called “functional resin composition"), wherein the mixed layer forms an island-in-the-sea structure in which the base resin is forming a continuous phase and the functional resin composition is forming discontinuous phases, and the area percentage of the functional resin composition in cross section is 25 to 55%. If the area percentage is larger than the above range, the appearance becomes defective due to whitening and if the area percentage is smaller than the above range, barrier property becomes poor.
- Fig. 1 shows melt viscosities of the base resin (PET), functional resin (MXD6), and functional resin composition (MXD6 + organic treated clay) of the functional resin (MXD6) and the inorganic fine particles (organic treated clay) blended at a ratio of 97:3 with respect to the shear rate. It will be obvious from Fig.
- melt viscosity of the functional resin composition is lower than the melt viscosity of the base resin in a range of 50 to 1000 sec -1 but the melt viscosity of the functional resin composition is higher than the melt viscosity of the base resin in a range of shear rates of 1 to 50 sec -1 .
- the reason is attributed to that the inorganic fine particles are neighboring one another being dispersed in the functional resin composition, and a three-dimensional structure is constituted by the intermolecular forces of the inorganic fine particles exhibiting specific viscosity characteristics.
- melt viscosity of the functional resin composition forming the discontinuous phases (island portions) is higher than the melt viscosity of the base resin, it becomes possible to form the mixed layer in which fine discontinuous phases are formed in many number despite the functional resin composition is blended in large amounts, but formability into the package decreases.
- the functional resin composition containing inorganic fine particles By utilizing the above-mentioned property of the functional resin composition containing inorganic fine particles according to the present invention, formability into the package is maintained by forming the package under a condition in which the melt viscosity of the functional resin composition containing inorganic fine particles is higher than the melt viscosity of the base resin while forming the mixed layer having an island-in-the-sea structure in which the base resin forms the continuous phase and the functional resin composition forms the discontinuous phases. Besides, according to the present invention, since inorganic fine particles are contained in the functional resin composition, the island-in-the-sea structure can be easily formed despite the functional resin composition is blended in large amounts.
- the island-in-the-sea structure is formed in the mixed layer, and the area percentage of the functional resin composition in cross section thereof is in a range of 25 to 55%, making it possible to efficiently express the function stemming from the functional resin having barrier property, to improve the adhesion between the mixed layer containing the base resin and the other layer, and to effectively prevent peeling among the layers in the multi-layer structure.
- the island-in-the-sea structure formed in the mixed layer has islands (domains) of small diameters constituting a small-islands-dispersed-in-sea structure, expression of pearl-tone luster is effectively prevented, that is specific to the resin composition comprising the base resin and the functional resin composition, and excellent transparency is obtained, too.
- the package of the invention makes it possible to form the mixed layer having the island-in-the-sea structure without impairing the formability into the package.
- the package has the mixed layer forming the island-in-the-sea structure which is forming a continuous phase (sea portion) of the base resin and discontinuous phases (island portions) of the functional resin composition, the area percentage of the functional resin composition in cross section thereof being in a range of 25 to 55% and, specifically, 27 to 55%.
- the area ratio stands for a ratio of the area of the island potions of the functional resin composition to the whole area of the mixed layer in any cross section.
- the island portions comprising the functional resin composition are present at an area percentage in the above range, the function such as gas-barrier property possessed by the functional resin is desirably expressed, and the adhesion among the layers is improved, too, due to the base resin.
- the island-in-the-sea structure in the mixed layer is formed by being melt-blended under the condition where the melt viscosity of the functional resin composition is larger than the melt viscosity of the base resin.
- the melt viscosities are adjusted by so setting the shape of the screw in the cylinder of the forming machine, rotational speed thereof, temperature and injection speed that the shear rate becomes 1 to 50 sec -1 , and the base resin and the functional resin composition are blended in a manner that the area percentage of the functional resin composition lies in the above range.
- the discontinuous phases (island portions) comprising the functional resin composition containing inorganic fine particles have an average grain size in a range of 1.5 to 5.5 ⁇ m in the unstretched portion.
- thermoplastic polyester resin As the base resin used in the invention, there can be exemplified thermoplastic polyester resin, polycarbonate resin, polyacrylonitrile resin, polyolefin resin and polyvinyl chloride resin.
- the thermoplastic polyester resin is preferred.
- thermoplastic polyester resins further, it is particularly desired to use polyethylene terephthalate (PET), copolymer using isophthalic acid or cyclohexanedimethanol (CHDM) as part of terephthalic acid or ethylene glycol in the polyethylene terephthalate, or polyethylene naphthalate.
- PET polyethylene terephthalate
- CHDM cyclohexanedimethanol
- the base resin has adhesiveness to the resin that constitutes the layers that come in contact with the intermediate layer.
- the base resin there can be used the resin of the same kind as that of the inner and outer layers, or the one that has heretofore been used as an adhesive resin for forming an adhesive layer, such as carboxylic acid like maleic acid, itaconic acid or fumaric acid, or graft-modified olefin resin graft-modified with an anhydride of the above carboxylic acid or with amide or ester.
- the olefin resin that is to be graft-modified there can be preferably used polyethylene, polypropylene or ethylene/ ⁇ -olefin copolymer.
- the base resin may be blended with known resin blending agents, such as filler, coloring agent, heat stabilizer, weather resisting stabilizer, anti-aging agent, photo stabilizer, ultraviolet ray absorber, antistatic agent, lubricant such as metal soap or wax, and resin or rubber for reforming according to recipe known per se.
- resin blending agents such as filler, coloring agent, heat stabilizer, weather resisting stabilizer, anti-aging agent, photo stabilizer, ultraviolet ray absorber, antistatic agent, lubricant such as metal soap or wax, and resin or rubber for reforming according to recipe known per se.
- the inorganic fine particles used in the invention are inorganic fine particles having an average grain size of not larger than 10 ⁇ m and, specifically, in a range of 1 to 5 ⁇ m. Adding them to the functional resin and kneaded together therewith, undergo inorganic fine particles exfoliation, that cause the permeating gasses to detour. Therefore, the gas-barrier property can be further improved being compounded by the gas-barrier property possessed by the gas-barrier resin.
- the inorganic fine particles used in the invention there can be exemplified inorganic fine particles comprising known lamellar compounds, metal oxides and metals.
- silicate minerals such as mica, vermiculite and smectite and, preferably, lamellar silicates of the type of 2-octahedron and 3-octahedron having electric charge densities of 0.25 to 0.6.
- 2-octahedrons there can be preferably used montmorillonite, beidellite and nontronite.
- 3-octahedrons there can be preferably used clays such as hectorite and saponite. It is specifically desired to use an organic treated clay obtained by swell-treating a clay with an organizing agent.
- the montmorillonite is particularly desired since it has highly swelling property, undergoes the swelling as the organizing agent permeates therein, and space among the layers spreads.
- a quaternary ammonium salt is preferably used. More preferably, a quaternary ammonium salt having at least one or more alkyl groups with not less than 12 carbon atoms is used and, concretely, a trimethyldodecylammonium salt or a trimethyltetradecylammonium salt is used.
- the inorganic fine particles are added to the functional resin at a ratio of 1 to 10% by weight and, specifically, 1 to 8% by weight. If the amount of the inorganic fine particles is less than the above range, the gas-barrier property is not sufficiently attained by the addition of the inorganic fine particles as compared to when the inorganic fine particles are added in an amount in the above-mentioned range. If the amount of the inorganic fine particles is more than the above range, on the other hand, the formability becomes inferior to that of when the inorganic fine particles are added in an amount in the above-mentioned range, which is not desirable.
- the functional resins that impart the function of barrier property or gas-barrier property and oxygen-absorbing property to the package can be divided into the following three kinds:
- the gas-barrier resin (G1) that can be used as the functional resin (K1) there can be preferably used an ethylene/vinyl alcohol copolymer, e.g., a saponified product of copolymer obtained by saponifying an ethylene/vinyl acetate copolymer having an ethylene content of 20 to 60 mol% and, specifically, 25 to 50 mol% that the degree of saponification is not less than 96% and, specifically, not less than 99 mol%.
- an ethylene/vinyl alcohol copolymer e.g., a saponified product of copolymer obtained by saponifying an ethylene/vinyl acetate copolymer having an ethylene content of 20 to 60 mol% and, specifically, 25 to 50 mol% that the degree of saponification is not less than 96% and, specifically, not less than 99 mol%.
- the ethylene/vinyl alcohol copolymer (saponified product of ethylene/vinyl acetate copolymer) must have a molecular weight large enough for forming a film and, desirably, has an intrinsic viscosity of, usually, not less than 0.01 dl/g and, specifically, not less than 0.05 dl/g as measured in a mixed solvent of phenol/water of a mass ratio of 85/15 at 30°C.
- polyamide resin (P1) As the gas-barrier resin other than the ethylene/vinyl alcohol copolymer, there can be exemplified a polyamide resin (P1).
- the polyamide resin (P1) there can be exemplified (a) an aliphatic, alicyclic or semi-aromatic polyamide derived from a dicarboxylic acid component and a diamine component, (b) a polyamide derived from an aminocarboxylic acid or a lactam thereof, or a copolyamide thereof or a blend thereof.
- the polyamide resins (P1) it is desired to use a xylylene group-containing polyamide to attain the object of the invention.
- a homopolymer such as polymetaxylyleneadipamide (MXD6), polymetaxylylenesebacamide, polymetaxylylenesuberamide, polyparaxylylenepimeramide, or polymetaxylyleneazelamide; or a copolymer such as metaxylylene/paraxylyleneadipamide copolymer, metaxylylene/paraxylylenepimeramide copolymer, metaxylylene/paraxylylenesebacamide copolymer, or metaxylylene/paraxylyleneazelamide copolymer; or a copolymer obtained by copolymerizing these monopolymers or copolymers with an aliphatic diamine such as hexamethylenediamine, an alicyclic diamine such as piperazine, an aromatic diamine such as para-bis(2-aminoethyl)benzene, an aromatic dicarboxylic acid such as terephthal
- the diamine component comprising chiefly the xylylenediamine stands for a diamine component in which the content of xylylenediamine is not less than 60 mol%, preferably, not less than 70 mol% and, particularly preferably, not less than 80 mol%.
- the xylylene group-containing polyamide has superior oxygen-barrier property to other polyamide resins, and is particularly desired for attaining the object of the invention.
- the polyamide resin (P1) too, must have a molecular weight large enough for forming a film, and has a relative viscosity of, desirably, not less than 1.1 and, specifically, not less than 1.5 as measured, for example, in the concentrated sulfuric acid (concentration of 1.0 g/d) at 30°C.
- the above gas-barrier resin (G1) can be used as the gas-barrier resin (G2) that constitutes the functional resin (K2) for imparting gas-barrier and oxygen-absorbing functions to the package of the invention.
- the polyamide resin (P2) is to be used as the gas-barrier resin (G2), in this case, it is desired that the polyamide resin that is used has gas-barrier property but does not almost have oxygen-absorbing property, and has terminal amino groups in an amount of not less than 40 eq/10 6 g.
- the polyamide resin (P2) it is desired to use a polyamide resin obtained by the polycondensation reaction of the diamine component chiefly comprising the xylylenediamine and the dicarboxylic acid component and, specifically, to use a xylylene group-containing polyamide resin.
- the diamine component comprising chiefly the xylylenediamine stands for a diamine in which the content of xylylenediamine is not less than 60 mol%, preferably, not less than 70 mol% and, specifically, not less than 80 mol%.
- the polyamide resin (P3) can be exemplified as the oxidizing organic component (Y3) that constitutes the functional resin (K3) for imparting gas-barrier and oxygen-absorbing functions to the package of the invention.
- the polyamide resin (P3) that is used has gas-barrier property and oxygen-absorbing property, and has terminal amino groups in an amount of less than 40 eq/10 6 g.
- the polyamide resin (P3) it is desired to use a polyamide resin obtained by the polycondensation reaction of the diamine component chiefly comprising the xylylenediamine and the dicarboxylic acid component and, specifically, to use a xylylene group-containing polyamide resin.
- the diamine component comprising chiefly the xylylenediamine stands for a diamine in which the content of xylylenediamine is not less than 60 mol%, preferably, not less than 70 mol% and, specifically, not less than 80 mol%.
- the oxidizing organic component (Y2) there can be exemplified an ethylenically unsaturated group-containing polymer. That is, the polymer has a carbon-carbon double bond. The double-bonded portion is easily oxidized with oxygen; i.e., oxygen is absorbed and trapped.
- the ethylenically unsaturated group-containing polymer is derived, for example, from polyene as a monomer.
- polyene examples include conjugated dienes such as butadiene and isoprene; chain nonconjugated dienes such as 1,4-hexadiene, 3-methyl-1,4-hexadiene, 4-methyl-1,4-hexadiene, 5-methyl-1,4-hexadiene, 4,5-dimethyl-1,4-hexadiene and 7-methyl-1,6-octadiene; cyclic nonconjugated dienes such as methyltetrahydroindene, 5-ethylidene-2-norbornene, 5-methylene-2-norbornene, 5-isopropylidene-2-norbornene, 5-vinylidene-2-norbornene, 6-chloromethyl-5-isopropenyl-2-norbornene and dicyclopentadiene; trienes such as 2,3-diisopropylidene-5-norbornene, 2-ethylene
- the oxidizing polymer there can be used a homopolymer of the above polyene, or a random copolymer or a block copolymer of two or more of the above polyenes in combination or in further combination with other monomers.
- the other monomers to be copolymerized with the above polyenes there can be exemplified ⁇ -olefins having 2 to 20 carbon atoms, such as ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecane, 1-hexadecene, 1-heptadecene, 1-nonadecene, 1-eicosene, 9-methyl-1-decene, 11-methyl-1-dodecene and 12-
- styrene there can be, further, used styrene, vinyltriene, acrylonitrile, methacrylonitrile, vinyl acetate, methyl methacrylate and ethyl acrylate.
- polybutadiene polyisoprene (IR)
- IR polyisoprene
- NBR nitril-butadiene rubber
- SBR styrene-butadiene rubber
- EPDM ethylene-propylene-diene rubber
- the polyene type polymers are acid-modified polyene polymers into which carboxylic acid groups, carboxylic anhydride groups or hydroxyl groups are introduced.
- the monomers used for introducing these functional groups there can be exemplified ethylenically unsaturated monomers having functional groups.
- the oxidizing organic component comprising these oxidizing polymers or copolymers thereof is desirably contained in the oxygen-absorbing resin composition at a ratio of 0.01 to 10% by weight and, specifically, at a ratio of 1 to 8% by weight.
- the functional resins (K2, K3) of the invention can use the same transition metal catalyst (S).
- the transition metal catalyst (S) there can be preferably used a metal of the Group VIII of periodic table, such as iron, cobalt or nickel.
- a metal of the Group I such as copper or silver
- a metal of the Group IV such as tin, titanium or zirconium
- a metal of the Group V such as vanadium
- a metal of the Group VI such as chromium
- a metal of the Group VII such as manganese.
- cobalt works to greatly enhance oxygen-absorbing property (oxidation of the oxidizing organic component) and is, particularly, suited for the object of the invention.
- the transition metal catalyst (S) is, usually, used in the form of a low-valent inorganic salt, organic salt or complex of the transition metal.
- a carboxylate of cobalt is particularly desired.
- the oxygen-absorbing resin composition constituting the functional resins (K2 and K3) used in the invention contains the transition metal catalyst (S) at a concentration of 100 to 3000 ppm calculated as a transition metal or, concretely, contains cobalt at a concentration of 100 to 2000 ppm, iron at a concentration of 150 to 1500 ppm or manganese at a concentration of 200 to 2000 ppm.
- S transition metal catalyst
- the above functional resins (K1, K2, K3) or, concretely, the gas-barrier resins (G1, G2, G3) or the oxygen-absorbing resin compositions (Y2 and Y3) may be blended with known resin blending agents, such as filler, coloring agent, heat stabilizer, weather resisting stabilizer, anti-aging agent, photo stabilizer, ultraviolet ray absorber, antistatic agent, lubricant such as metal soap or wax, and resin or rubber for reforming according to recipe known per se. in addition to being blended with the above-mentioned inorganic fine particles. Prior to being mixed into the base resin, further, it is desired that the inorganic fine particles are dispersed in advance in the functional resin.
- the package of the invention can be used in the form of bottle, cup, tray, tubular container, film or sheet and, desirably, has a multi-layer structure from the standpoint of beautiful looking, appearance and flavor-retaining property.
- the package may have a single-layer structure.
- the mixed layer is provided on the inside of the outer surface of the container so that the inorganic fine particles will not be exposed on the outer surface of the container. It is, further, desired that the mixed layer is provided on the outside of the inner surface of the container so will not to come in direct contact with the content.
- the mixed layer is desirably used as at least one intermediate layer of the multi-layer container.
- Fig. 2 is a schematic view of the multi-layer structure of an unstretched portion that has not been subjected to the stretch working in the multi-layer package of the invention.
- the multi-layer package 1 is of a two-kind-five-layer structure including an inner layer la, an outer layer 1b, an intermediate layer 2 and mixed layers 3. Between the inner layer 1a and the intermediate layer 2, and between the outer layer 1b and the intermediate layer 2, there are provided mixed layers 3 of an island-in-the-sea structure in which discontinuous phases 3b of the functional resin composition are formed in a continuous phase 3a of the base resin. Inorganic fine particles 4 are dispersed in the discontinuous phases 3b. Not being limited to the above constitution only, it is also allowable to use any known constitution such as two-kind-three-layer multi-layer structure having a mixed layer between the inner layer and the outer layer.
- thermoplastic resin of the other layer to be used in combination with the mixed layer of the multi-layer package there can be exemplified thermoplastic polyester resin, polycarbonate resin, polyacrylonitrile resin, polyolefin resin or polyvinyl chloride resin.
- a layer of the above gas-barrier resin may be, further, provided.
- use of the resin of the same kind as the base resin is desirable for improving adhesion among the layers.
- polyethylenes such as low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE); linear low-density polyethylene (LLDPE) and linear very low-density polyethylene (LVLDPE), polypropylene (PP), ethylene/propylene copolymer, polybutene-1, ethylene/butene-1 copolymer, propylene/butene-1 copolymer, ethylene/propylene/butene-1 copolymer, ethylene/vinyl acetate copolymer, ionically crosslinked olefin copolymer (ionomer) and blends thereof.
- PE polyethylenes
- LDPE low-density polyethylene
- MDPE medium-density polyethylene
- HDPE high-density polyethylene
- LLDPE linear low-density polyethylene
- LVLDPE linear very low-density polyethylene
- PP polypropylene
- PP ethylene/
- the gas-barrier resin there can be used a cyclic olefin copolymer (COC) and, specifically, a copolymer of ethylene and cyclic olefin.
- COC cyclic olefin copolymer
- polycarbonate resin polyacrylonitrile resin or polyvinyl chloride resin
- polyvinyl chloride resin there can be widely used any of them placed in the market for use as sheets.
- an adhesive resin may, as required, be interposed among the resin layers.
- the adhesive resin there can be exemplified a thermoplastic resin containing carbonyl (-CO-) groups based on carboxylic acid, carboxylic anhydride, carboxylate, carboxylic acid amide or carboxylic acid ester on a main chain or a side chain at a concentration of 1 to 700 meq/100 g of the resin and, specifically, at a concentration of 10 to 500 meq/100 g of the resin.
- the adhesive resin include ethylene/acrylic acid copolymer, ionically crosslinked olefin copolymer, maleic anhydride-grafted polyethylene, maleic anhydride-grafted polypropylene, acrylic acid-grafted polyolefin, ethylene/vinyl acetate copolymer, copolymerized polyester and copolymerized polyamide which may be used in one kind or in two or more kinds in combination.
- These resins can be effectively laminated by the simultaneous extrusion or by the sandwich-lamination.
- the film of a mixture formed in advance can be laminated and adhered on the film of a moisture-resistant resin by also using an isocyanate type or epoxy type thermosetting adhesive resin.
- the mixed layer is formed having a thickness of 3 to 20% and, specifically, 5 to 17% of the whole thickness. If the thickness of the mixed layer becomes smaller than the above range, the barrier property becomes inferior to that of when the thickness thereof is in the above range. Even if the thickness becomes larger than the above range, no particular advantage is obtained in regard to barrier property but rather disadvantage results in regard to economy, such as an increase in the amount of the resin and in regard to container properties, such as decrease in the flexibility and softness of the material.
- the resins are melt-kneaded together by using an extruding machine depending upon the kinds of the resins, and the mixture thereof is formed into a preform by injection forming or compression forming, and the preform is formed into the multi-layer bottle by biaxial stretch-blow forming.
- the mixture is melt-kneaded under a condition in which the shear rate is in a range of 1 to 50 sec -1 . This enables the melt viscosity of the functional resin composition to become larger than the melt viscosity of the base resin, and the functional resin composition containing inorganic fine particles constitutes fine discontinuous phases (islands) in many number.
- the resin composition is melt-kneaded by using an extruding machine and is, thereafter, primarily formed into a film, sheet or parison through a T-die, circular die (ring die) or the like die and is, further, secondarily formed into a package of the form of bottle, cup, tray or tubular container.
- a two-kind-three-layer (PET/intermediate layer/PET) multi-layer preform was prepared.
- a dry blend of the PET material and dry pellets of the barrier material was thrown into a hopper of the forming machine, and was co-injection-formed at 280°C by so setting the condition that the shear rate was 1 to 50 sec -1 .
- the obtained preform was heated at 92 to 103°C for 29 seconds and was blow-formed to prepare a 500-ml pressure-resistant bottle.
- the central portion of the preform and the lower portion of the bottle neck ring were cut out in cross section, and the cross sections of the intermediate layers were surfaced by using an ultramicrotome and on which Pt was deposited in vacuum for 30 seconds at 15 mA to obtain sample pieces.
- a scanning type electron microscope s-3400N: manufactured by Hitachi High Technologies Co.
- the surfaces of the sample pieces were observed at a magnification of 1000 times to observe the sectional structures of the intermediate layers in order to calculate the area percentages (%) of the domains.
- the longest diameters and the shortest diameters of the domains were measured, the areas of the domains were calculated by ⁇ (longest diameter + shortest diameter)/4 ⁇ 2 and were integrated to find the total area of the domains.
- the area % of the domains was calculated as (total domain area/observed area).
- the bottle was observed for its appearance with the eye to confirm if pearl-like tone was exhibited.
- the central portion of the bottle body wall was cut out (3 x 3 cm) and was measured by using a hazeometer [NDH-1001: manufactured by Nihon Denshoku Kogyo Co.].
- Intermediate layer A polymetaxylyleneadipamide (MXD6) and an organic treated clay (montmorillonite) were blended together at a ratio of 97:3 to prepare a functional resin composition which was then mixed with the isophthalic acid-copolymerized PET at a mixing ratio of 3:7 to form a mixed layer.
- a two-kind-three-layer bottle was formed having the inner/outer layers and the intermediate layer at a weight ratio of 94:6.
- a bottle was formed in the same manner as in Example 1 but forming the inner/outer layers and the intermediate layer at a weight ratio of 90:10.
- a bottle was formed in the same manner as in Example 1 but setting the mixing ratio of the intermediate layer to be 4:6, and forming the inner/outer layers and the intermediate layer at a weight ratio of 95:5.
- a bottle was formed in the same manner as in Example 1 but setting the mixing ratio of the intermediate layer to be 4:6, and forming the inner/outer layers and the intermediate layer at a weight ratio of 92:8.
- a bottle was formed in the same manner as in Example 1 but setting the mixing ratio of the intermediate layer to be 4:6, and forming the inner/outer layers and the intermediate layer at a weight ratio of 90:10.
- a bottle was formed in the same manner as in Example 1 but setting the mixing ratio of the intermediate layer to be 5:5, and forming the inner/outer layers and the intermediate layer at a weight ratio of 92:8.
- a bottle was formed in the same manner as in Example 1 but setting the mixing ratio of the intermediate layer to be 5:5, and forming the inner/outer layers and the intermediate layer at a weight ratio of 90:10.
- a bottle was formed in the same manner as in Example 4 but forming the intermediate layer by using the polymetaxyleneadipamide (MXD6) only.
- a bottle was formed in the same manner as in Example 5 but forming the intermediate layer by using the polymetaxyleneadipamide (MXD6) only.
- Table 1 shows the measured results of the domain area percentages, sectional structures of the intermediate layers, and appearances and hazes of the bottles obtained in Examples 1 to 5 and Comparative Examples 1 to 4.
- the island-in-the-sea structure By mixing the clay into the barrier material (MXD6) of the intermediate layer, the island-in-the-sea structure could be formed in the intermediate layer suppressing defective appearance caused by pearl-like tone of the bottle (Examples 4, 5 and Comparative Examples 3, 4).
- the mixing ratio of the PET and the barrier material functional resin composition to which clay was mixed
- the island-in-the-sea structure was formed with the barrier material forming islands.
- the area percentage was in excess of 55%, and hazes have greatly increased as compared to the bottles having area ratios of not larger than 55% (Examples 1 to 5 and Comparative Examples 1 and 2).
- the package of the invention is capable of preventing the flavor and taste of the content from being deteriorated by oxygen and is, further, capable of preventing the permeation of gases generated by the content which spontaneously produces pressure. Therefore, the package of the invention can be favorably used as a bottle, cup, tray or tubular container.
- the contents that can be filled may be such beverages as tea, coffee, beer, wine, fruit juices, carbonated soft drinks, etc., such foods as fruits, nuts, vegetables, meet products, infant's foods, coffee, jam, mayonnaise, ketchup, edible oils, dressings, sauces, foods boiled down in soy, milk products, etc., as well as medicines, cosmetics, gasoline and the like contents that undergo the deterioration in the presence of oxygen, to which only, however, the invention is in no way limited.
- beverages as tea, coffee, beer, wine, fruit juices, carbonated soft drinks, etc.
- foods as fruits, nuts, vegetables, meet products, infant's foods, coffee, jam, mayonnaise, ketchup, edible oils, dressings, sauces, foods boiled down in soy, milk products, etc., as well as medicines, cosmetics, gasoline and the like contents that undergo the deterioration in the presence of oxygen, to which only, however, the invention is in no way limited.
Landscapes
- Wrappers (AREA)
- Laminated Bodies (AREA)
- Packages (AREA)
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JP2009101021 | 2009-04-17 | ||
PCT/JP2010/056815 WO2010119938A1 (fr) | 2009-04-17 | 2010-04-16 | Boîtier |
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EP2420457A1 true EP2420457A1 (fr) | 2012-02-22 |
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US (1) | US20120141713A1 (fr) |
EP (1) | EP2420457A4 (fr) |
JP (1) | JP5626205B2 (fr) |
CN (1) | CN102395516B (fr) |
WO (1) | WO2010119938A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2335923A1 (fr) * | 2008-09-29 | 2011-06-22 | Toyo Seikan Kaisha, Ltd. | Récipient léger en polyester multicouche |
WO2014161653A1 (fr) * | 2013-04-03 | 2014-10-09 | Cedar Advanced Technology Group Ltd. | Récipient pour aliment, boisson ou produit pharmaceutique et son procédé de préparation |
Citations (7)
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EP1213326A1 (fr) * | 2000-12-08 | 2002-06-12 | Toyo Seikan Kaisha Limited | Matériau d'emballage et container à plusieurs couches |
JP2005059859A (ja) * | 2003-08-14 | 2005-03-10 | Toyo Seikan Kaisha Ltd | プラスチック包装体 |
JP2005067637A (ja) * | 2003-08-21 | 2005-03-17 | Mitsubishi Gas Chem Co Inc | 中空容器 |
JP2005119693A (ja) * | 2003-10-16 | 2005-05-12 | Toyo Seikan Kaisha Ltd | 包装体 |
EP1629971A1 (fr) * | 2003-05-19 | 2006-03-01 | Toyo Seikan Kaisha, Ltd. | Structure multicouche pour emballage |
JP2006056518A (ja) * | 2004-08-17 | 2006-03-02 | Toyo Seikan Kaisha Ltd | 包装容器、樹脂組成物の製造方法及び透明性に優れたリサイクル樹脂の製造方法 |
EP1655238A1 (fr) * | 2003-08-14 | 2006-05-10 | Toyo Seikan Kaisya, Ltd. | Contenant d'emballage |
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CN1211434C (zh) * | 1999-10-12 | 2005-07-20 | 东丽株式会社 | 树脂结构体及其用途 |
JP3794950B2 (ja) * | 2001-11-22 | 2006-07-12 | 三井化学株式会社 | オレフィン系熱可塑性エラストマー、複合成形体および複合成形体の製造方法 |
JP3903997B2 (ja) * | 2003-09-18 | 2007-04-11 | 東洋製罐株式会社 | 包装容器 |
-
2010
- 2010-04-16 CN CN201080017121.7A patent/CN102395516B/zh active Active
- 2010-04-16 JP JP2011509358A patent/JP5626205B2/ja active Active
- 2010-04-16 EP EP10764520A patent/EP2420457A4/fr not_active Withdrawn
- 2010-04-16 US US13/256,033 patent/US20120141713A1/en not_active Abandoned
- 2010-04-16 WO PCT/JP2010/056815 patent/WO2010119938A1/fr active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1213326A1 (fr) * | 2000-12-08 | 2002-06-12 | Toyo Seikan Kaisha Limited | Matériau d'emballage et container à plusieurs couches |
EP1629971A1 (fr) * | 2003-05-19 | 2006-03-01 | Toyo Seikan Kaisha, Ltd. | Structure multicouche pour emballage |
JP2005059859A (ja) * | 2003-08-14 | 2005-03-10 | Toyo Seikan Kaisha Ltd | プラスチック包装体 |
EP1655238A1 (fr) * | 2003-08-14 | 2006-05-10 | Toyo Seikan Kaisya, Ltd. | Contenant d'emballage |
JP2005067637A (ja) * | 2003-08-21 | 2005-03-17 | Mitsubishi Gas Chem Co Inc | 中空容器 |
JP2005119693A (ja) * | 2003-10-16 | 2005-05-12 | Toyo Seikan Kaisha Ltd | 包装体 |
JP2006056518A (ja) * | 2004-08-17 | 2006-03-02 | Toyo Seikan Kaisha Ltd | 包装容器、樹脂組成物の製造方法及び透明性に優れたリサイクル樹脂の製造方法 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2335923A1 (fr) * | 2008-09-29 | 2011-06-22 | Toyo Seikan Kaisha, Ltd. | Récipient léger en polyester multicouche |
EP2335923A4 (fr) * | 2008-09-29 | 2012-07-11 | Toyo Seikan Kaisha Ltd | Récipient léger en polyester multicouche |
WO2014161653A1 (fr) * | 2013-04-03 | 2014-10-09 | Cedar Advanced Technology Group Ltd. | Récipient pour aliment, boisson ou produit pharmaceutique et son procédé de préparation |
Also Published As
Publication number | Publication date |
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EP2420457A4 (fr) | 2012-08-29 |
JP5626205B2 (ja) | 2014-11-19 |
US20120141713A1 (en) | 2012-06-07 |
CN102395516B (zh) | 2014-05-28 |
CN102395516A (zh) | 2012-03-28 |
JPWO2010119938A1 (ja) | 2012-10-22 |
WO2010119938A1 (fr) | 2010-10-21 |
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